Activox 4L is a portable oxygen concentrator that is lightweight and hands free. Delivering up an equivalent of 4 LPM of pulse dose oxygen, the Activox 4L offers the Therapeutic Oxygen required by most oxygen patients. The Activox 4L maintains a small profile that is less cumbersome than many other Portable Oxygen Concentrators (POC). Equipped with an advanced o2 sensor that is standard with each Activox 4L model, no additional upgrades are necessary. Just image getting the oxygen you need where ever you need it without having to tote a bulky and heavy oxygen tank behind you. The Activox 4L frees you from constantly having to change oxygen cylinders and from the dangers of falling asleep when your oxygen tank is running low. This Activox provides an uninterrupted source of portable oxygen when you need it, where you need it.